Phonography.



No. 896,302. PATENTED AUG. 18, 1908.

I. KITSEE. PHONOGRAPHY.

APPLICATION FILED NOV. 1, 1907.

WITNESSES:

I No. 896,302.

ISIDOR KITSEE, OF PHILADELPHIA, PENNSYLVANIA.

PHONOGRA'PHY.

Specification-20f Letters Patent.

Patented Aug. is, 1908.

Application filedNovember 1, 1907. Serial No. 400,175.

i T all'who'm it may concern:

. Be it known that I, Isrnon KrrsEE, citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inPhonography, of which the following is a specification.

My invention relates to an improvement in phonography. Its object is toroduce a phonographic record with the ai of which sounds maybereproduced.

In the drawing, Figures 1 and 2 are plan views of records at difi'erentstages and Fig. 3 is a sectional view ofthe finished record.

To produce the final record in accordance with this, my invention, it isfirstnecessary to produce the recording lines, due to the sound waves,in a manner so as to be able to hotograph the same; and in the drawing,

ig. 1 illustrates this step of'my invention;

and in this figure, 1 is the material on which the lines-of'record aremarked and 2 are the lines of record. I prefer that the material -1should be transparent and the lines 2 opaque to the rays of light. Ihave found that trac+ ing cloth is well adapted for the purpose and avery expedient wa of producing the hues of record is, by simp y drawing,with the aid of a colored fluid, the lines on said cloth; the

means to draw said lines being operatively,

related to the phonographic diaphragm. I use this plate or record as a'positive to produce photographically a negative therefrom.

The process of producing a photographic negative is well understood anddoes not need to be enlarged upon here.- It suffices to say that thoseplaces which are in the positive opaque to the rays of light will beproduced in the negative in a manner so as to be transparent to the raysof light andvice versa the places transparent to the rays of light onthe positive will be opaque to the rays of hght on the negative,provided that the negative is made and washed in accordiance with 'the'usual process, and Fig. 2 represents such a negative; in this figure, 3designates the parts opaque to the rays of light and 2 the lines ofrecord now transparent to the rays of light.

To produce a record plate, with the aid of which sounds may bereproduced, I have recourse to the following arrangement:I cover asuitable base, such for instance as a metallic plate, with acomparatively thick layer of gelatin, in which a chrome, such forinstance as a bi-chromate of potassium, is

dissolved. This plate is carefully screened from the rays of light.dried, that is ripenedas I call it it is subjected to the rays of lightwith the interposition of the negative The rays of light will,therefore, only strike those parts of the gelatin coating'which are notprotected by the opa no material of the negative. In other wor s, onlysuch parts of the gelatin coating will be exposed to the light ascorrespond to the transparent lines of record on the negative; all otherarts of'the gelatin coating being screened l i'onrthe rays of light bythe opaque parts of said negative. After 7 the necessary exposure, thegelatin plate is removed from the source of light. When a gelatin,intermixed with a bi-chromate of potassium, is exposed to the rays oflight,

those parts on which the rays of light fall will become hard and dry,whereas, such parts which are screened from the rays of light willremain in their pliable state. gelatin so prepared is moistened withluke warm water, those parts, formerly exposed to the-rays, will remainunaltered, but the parts screened fromthe rays will take up part of thewater and will thereby swell up.

he plate so manipulated will present a surface comprising raised anddepressed parts. The raised parts are due to the swelling up of thegelatin formerly screened from the light and the depressed partsrepresent the gelatin not raised. through the action of the water. Ithas been necessary to thus make clear the action of light on gelatinhaving intermixed therein a bi-chromate of otassium, so that theproduction of the fina record should be well understood by personsversed in the art.

As stated above, the late of gelatin is, after due exposure to t elight, removed from this source. To produce the necessary change in'-this gelatin plate, so' as to be able to use the lines of record for thereproduction of sound, it is necessary to depress these lines, or whatis the same to' raise the parts lntervenlng, and for this'purpose, suject the plate to the action of moisture.

I Fig. 3 represents such final record and in this rec' After the platehas When now a 0rd, 5 is the support plate; 4. the prepared gelatinand'2 are the lines of record, here shownlnintaglio.

Having now described my invention, what I claim as new and desire tosecure by Let ters Patent is: p

1-. The method of producing phonographic records, which consists inobtaining a positive of the sound waves, then producing a records, whichconsists in recording the,

sou'ndwaves in a manner to render them susceptible of photographicreproduction, then producing photographically a negative therefrom, thenexposing a sensitized gelatinous surface through the transparentportions of said negative to the action of light rays, and finallyraising the portions of the sensitized surface not exposed by thenegative, whereby the exposed portions are depressed relatively to t eunexposed'portions.

3. The method of producing phonographic records, which consists inrecording the sound waves in opaque lines upon a trans.

parent body to obtain a positive of said sound waves, then producingphotographically a negative thereof, then exposing a sensitizedgelatinous surface through the transparent portions of said negative tothe action of light rays, and finally raising'the portions of thesensitized surface not exposed by the negative, whereby the exposedportions are depressed relatively to the unexposed portions.

4. The method of producing phonographic records, which consists inobtaining a positive of the sound waves, then producing a negativetherefrom with portions thereof transparent to rays of light, thenexposing a chromated gelatinous surface through the transparent ortionsof said negative to the action of the ight rays, and finally subjectingto the action of moisture. the portions of the surface not exposed bythe negative, whereby said portions are raised relatively to the exposedportions.

5. The method of producing phonographic records, which consists inrecording the sound waves in a manner to render them 6. The method ofproducing phonographic records, which consists in recording the soundWaves in opaque lines upon a transparent body to obtain a positive ofsaid sound waves, then producing photographically a negative thereof,then exposing a chromated gelatinous surface through the transparentportions of said negative to the action of light rays, and finallysubjecting to the action of moisture the portions of the surface notexposed by the negative, whereby said portions are raised relatively tothe expgsed portions. 1

testimony whereof I affix my signature in presence of two witnesses.

ISIDOR KrrsEE.

Witnesses:

EDITH R. STILLEY, MARY 0. SMITH.

